From da7b762f4adb0341cea53e759965cac9c3b2e375 Mon Sep 17 00:00:00 2001
From: Johannes Altmanninger <aclopte@gmail.com>
Date: Sat, 7 Mar 2020 13:01:03 +0100
Subject: [PATCH] Make default hg prompt leaner

The default hg prompt is slow on large repositories (hg status takes
2-3 seconds on mozilla-central) which is unacceptable as a default.

Mimick our git prompt: by default, only show the current branch.
If the new variable $fish_prompt_hg_show_informative_status is set,
then use the old behavior.

[ci skip]
---
 doc_src/cmds/fish_hg_prompt.rst     | 7 ++++++-
 share/functions/fish_hg_prompt.fish | 6 ++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/doc_src/cmds/fish_hg_prompt.rst b/doc_src/cmds/fish_hg_prompt.rst
index 06cbea5ef..3d822bfe1 100644
--- a/doc_src/cmds/fish_hg_prompt.rst
+++ b/doc_src/cmds/fish_hg_prompt.rst
@@ -19,7 +19,11 @@ The fish_hg_prompt function displays information about the current Mercurial rep
 
 `Mercurial <https://www.mercurial-scm.org/>`_ (``hg``) must be installed.
 
-There are numerous customization options, which can be controlled with fish variables.
+By default, only the current branch is shown because ``hg status`` can take be slow on large repository. You can enable a more informative prompt by setting the variable ``$fish_prompt_hg_show_informative_status``, for example::
+
+	set --universal fish_prompt_hg_show_informative_status
+
+If you enabled the informative status, there are numerous customization options, which can be controlled with fish variables.
 
 - ``$fish_color_hg_clean``, ``$fish_color_hg_modified`` and ``$fish_color_hg_dirty`` are colors used when the repository has the respective status.
 
@@ -52,6 +56,7 @@ A simple prompt that displays hg info::
 
     function fish_prompt
         ...
+        set -g fish_prompt_hg_show_informative_status
         printf '%s %s$' $PWD (fish_hg_prompt)
     end
 
diff --git a/share/functions/fish_hg_prompt.fish b/share/functions/fish_hg_prompt.fish
index 8911fbfdc..d0131bced 100644
--- a/share/functions/fish_hg_prompt.fish
+++ b/share/functions/fish_hg_prompt.fish
@@ -36,6 +36,12 @@ function fish_hg_prompt --description 'Write out the hg prompt'
         set branch "$branch|$bookmark"
     end
 
+    if not set -q fish_prompt_hg_show_informative_status
+        set_color normal
+        echo -n " ($branch)"
+        return
+    end
+
     echo -n '|'
 
     # Disabling color and pager is always a good idea.